Sievers' Theory of Anglo-Saxon Meter

Eduard Sievers developed a theory of the meter of Anglo-Saxon Alliterative verse. This most likely would have been the theory of Anglo-Saxon prosody that Ezra Pound would have been familiar with.ref|zbc

A line of Anglo-Saxon verse is made up to two half-lines. Each of these half-lines contains two main stresses (or 'lifts'). Sievers categorized three basic types of half-line that were used. Here a stressed syllable is represented by the symbol '/' and an unstressed syllable by the symbol 'x'.

He also noted that three possible types of half-line were not used:
*/ x x /
*/ / x x
*x x / /

However the first two of these can be used if one of the 'dips' is changed into a half-stress (or 'half lift' ... notated here 'x́'):

References

#Brooke-Rose, Christine, "A ZBC of Ezra Pound," Faber and Faber, 1971. ISBN 0-571-09135-0 (page 88)